--- a/usr/src/blackmagic-15.2a1/blackmagic_lib.c
+++ b/usr/src/blackmagic-15.2a1/blackmagic_lib.c
@@ -341,7 +341,7 @@ dl_uptime(void)
 #endif
 }
 
-inline unsigned long long dl_get_time_us()
+inline unsigned long long dl_get_time_us(void)
 {
 #if KERNEL_VERSION_OR_LATER(5, 6, 0)
 	struct timespec64 t;
@@ -648,7 +648,7 @@ dl_access_ok(int type, void *addr, unsig
 }
 
 void *
-dl_get_current()
+dl_get_current(void)
 {
 	return current;
 }
@@ -844,7 +844,7 @@ int dl_strcmp(const char* str1, const ch
 	return strcmp(str1, str2);
 }
 
-void dl_schedule()
+void dl_schedule(void)
 {
 	schedule();
 }
--- a/usr/src/blackmagic-io-15.2a1/bm_locks.c
+++ b/usr/src/blackmagic-io-15.2a1/bm_locks.c
@@ -173,7 +173,7 @@ void bm_rwlock_write_unlock_irqrestore(b
 }
 
 /* Basic mutex */
-bm_mutex_t* bm_mutex_alloc()
+bm_mutex_t* bm_mutex_alloc(void)
 {
 	bm_mutex_t* mutex = bm_kmalloc(sizeof(bm_mutex_t));
 	mutex_init(mutex);
--- a/usr/src/blackmagic-io-15.2a1/bm_util.c
+++ b/usr/src/blackmagic-io-15.2a1/bm_util.c
@@ -210,7 +210,7 @@ int bm_printk(const char *fmt, ...)
 	return r;
 }
 
-void bm_backtrace()
+void bm_backtrace(void)
 {
 	dump_stack();
 }
@@ -915,7 +915,7 @@ void bm_iowrite32be(uint32_t val, volati
 	iowrite32be(val, (void*)addr);
 }
 
-void bm_util_init()
+void bm_util_init(void)
 {
 	init_event_table();
 }